UK Transit Thermal Stress & Cabin Climate Modeler

Double-Decker Thermodynamic Cross-Section Sealed Hybrid Routemaster

850 W/m²) ZONE 3: UPPER DECK (Greenhouse Trap) 39.2°C Ceiling Radiation + Trapped Convection ZONE 1: CABIN 37.8°C WBGT: 30.4°C Windscreen (SHGC 0.68) ZONE 2: LOWER SALOON 34.6°C Metabolic Load: 3,200W ENGINE BAY 85°C Soak Bulkhead bleed

Driver Cab Temp

37.8°C

+6.3°C above ambient

Driver WBGT Risk

30.4°C

High Risk / 30m Rest

Upper Deck Greenhouse

39.2°C

Severe commuter heat

Safe Drive Duration

65 min

Before heat exhaustion limit

Route Shift Cabin Temperature & Fatigue Trajectory (5-Hour Duty Cycle) TUC 30°C Action Limit vs Actual

Boundary Conditions

Fleet Archetype

Ambient Temp 31.5°C

Humidity 48%

Solar Irradiance 850 W/m²

Occupancy 80%

Traffic Idling Ratio 45%

Cab AC / Fan Mode

Engineering Interventions Live Counterfactuals

Solar Ceramic Windscreen Film (SHGC 0.38)

Solar-Reflective White Roof Coating

Engine Bulkhead Aerogel Thermal Blanket

Forced Upper-Deck Exhaust Evacuators

HSE / TUC Compliance Assessment

Labor Risk: High Occupational Heat Strain

Recommended Intervention: Active HVAC Retrofit + Solar Windscreen Film (42% thermal load reduction)

Cab temperature exceeds maximum sustained cognitive threshold (36°C).
WBGT 30.4°C mandates 30 minutes rest per 30 minutes driving under ISO 7243.
Upper saloon exceeds 38°C causing passenger heat complaints.

UK Transit Thermal Audit Report